This circuit, found in a 1964 US documentation, consists of a selective amplifier that lets only 10 Hz pass around a 400 Hz center frequency with the indicated components.
Radio Electronics published this circuit in a 90's edition. The circuit makes use of an uncommon...
This circuit had its assembly described in a Radio Electronics from March 1963. The circuit uses 2...
This stage can be used in power supplies to increase the current capability up to 10 A. The...